Thalamic oscillations distinguish natural states of consciousness in humans
Chowdhury, A.; Kaufmann, E.; Schreiner, T.; Koeglsperger, T.; Mehrkens, J.-H.; Remi, J.; Vollmar, C.; Staudigl, T.
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AbstractNatural states of consciousness are thought to be regulated by deep brain structures such as the thalamus. However, very little is known about the underlying electrophysiology in humans. Using a rare opportunity to directly record from the human thalamus, we identify a hitherto- unreported brain-state-specific oscillation. We find that the oscillation is present only during Rapid Eye Movement (REM) sleep and wakefulness, while being entirely absent during Non- REM sleep. The oscillation further distinguishes REM sleep microstates, co-occurring with bursts of eye movements, and is specific to the Central Thalamus, a structure implicated in causing global brain state transitions. The discovery of a distinct oscillatory signature in the Central Thalamus that distinguishes conscious states opens up avenues to further investigate thalamic contributions to human consciousness and refine interventions to treat disorders of consciousness.
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